Do option trades on FOPs count as a day trade?

No, option trades on FOPs do not count as a day trade as they are considered commodities. Only trades on US or non-US securities (Stocks, Stock and Index Options, Warrants, T-Bills or Bonds) count as a day trade. 

You can find an Overview of Pattern Day Trading ("PDT") Rules on the IBKR website.

Accounts that have not yet been migrated to the intraday margin standards are still subject to the Pattern Day Trading (PDT) rules and are not yet subject to Intraday Margin Deficit (IMD) calls. For more information on the FINRA rule change please review the FAQs on IMD.

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